import numpy as np

x=int(input())
if x>=30:
    print("Yes")
else:
    print("No") import numpy as np numpy x=int(input()) x int(input()) int input() input if x>=30:
    print("Yes")
else:
    print("No") x>=30 x 30 print("Yes") print "Yes" print("No") print "No" x=int(input()) int(input()) x
import numpy as np

x=int(input())
if x>=30:
    print("Yes")
else:
    print("No")